I recommend using itch.io's collection system to keep track of games you'd like to play later. There are add to collection buttons on the top right of a project page. Since most games on itch.io are free, ownership works differently here. You only own paid content that you've purchased, or received a key for. You don't own free games. This is done like this because free games often change a lot, including how they are distributed, and we want to keep things flexible for creators to control how their project goes out.
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